[djohnson308]

We've seen dual centrifugal superchargers, dual roots and obviously twin turbos. But why has no one done centrifugal and a root supercharger, you would get boost through the entire RPM range...


I guess im asking for two reasons, one being I have a vortech centrifugal but would love the root sound and the low end a root gives you. But being that I already have a vortech I would like to keep it in place! and secondly my inner child questioning why no one has done something his ridiculous and cool


The only limitation I see is if a root does not allow additional air to pass through it, or would a quick fuel blow through carb not function on the low end?


thoughts!?

 

[techinspector1]

If you have cubic money, anything is possible.

 

[djohnson308]

haha that is probably the most logical and respective answer out there. Id be really interested in making this reality I just don't know the feasibility!

 

[cobalt327]

Why there doesn't seem to be any roots/centrifugal setups around, I can't really say. But there's not a lot doubling up blowers can do that a single stage blower can't do as well, but for less money, less complication, less weight, and less heat. That said, some WWII aircraft used dual stage supercharging and there was a VW inline 4 that used a turbo/supercharger setup in racing, and then there was Dobbertin's creation (twin turbo/twin roots blowers. And nitrous):

 

[spinn]

One does it. I have boost all through. The blower is connected to the crank. I had the opportunity to try a turbo kit and jrsc kit on the same vehicle. Turbos do not have the infinitely larger feeling off the line.

I like the eatons. They are for the most part silent.

Fun stuff.

 

[ASE Doc]

That Dobberton set up is just crazy. Imagine that showing up in your service bay for a timing chain swap. "customer needs it by the end of the day". Lol

 

[ap72]

Turbos do not have the infinitely larger feeling off the line.

that depends on what turbo is used.

There is very little if anything that a blower can do that a turbo can't do as well or better.

The trick is building the right turbo for the job.

 

[timothale]

aixal flow

and in the 50's Latham built aixal flow, they claimed less heat build up.
http://www.ebay.com/itm/Vintage-Lat...ies&hash=item2ecb0aa249&vxp=mtr#ht_3788wt_981
http://www.bing.com/images/search?q...617D0D47AA7CC1A6332826D892638&selectedIndex=2http://www.bing.com/images/search?q...617D0D47AA7CC1A6332826D892638&selectedIndex=2
http://www.bing.com/images/search?q...617D0D47AA7CC1A6332826D892638&selectedIndex=2

 

[spinn]

that depends on what turbo is used.

There is very little if anything that a blower can do that a turbo can't do as well or better.

The trick is building the right turbo for the job.

No it doesn't.

No it can't.

 

[timothale]

paxton 2 speed ?

I worked on a friends Hot Corvair that has a paxton 2 speed. It gave lots of torque off the line then the blower slowed down at higher engine rpm so you wouldn't over boost.

 

[spinn]

If you had an different experience where you got to use a turbo and then supercharger on the same car at the same boost. Please share the vehicle and kits you used to get your conclusion.

 

[ap72]

a quick and easy comparison would be the LNF vs the LSJ engines from Chevy, though there are some other minor variances beside the turbo/supercharger.

BTW, there are two minor things wrong with your question- 1) "boost" doesn't matter, "mass flow" is what you're after 2) you assume that a properly matched turbo comes in a kit Almost all kits use common shelf stock turbos that are NOT optimised for any particular combo- similar to a "white box" cam- it'll be close enough for most people but not a perfect match. Matching a turbo is FAR easier than matching a supercharger btw.

 

[spinn]

You drive a what now?

Which kit did you install?

Nothing was wrong with my question.

 

[CNC-Dude]

that depends on what turbo is used.

There is very little if anything that a blower can do that a turbo can't do as well or better.

The trick is building the right turbo for the job.

That could be true up to a point. But if it were true all the way across the board, then why don't they use turbos in Top Fuel and Funny Car instead of blowers....

 

[spinn]

We need a kid now to come in and tell us about his 40 psi whatever. I love that. Some johnny wants to go faster, claiming with only 10 psi boost more and 10 degrees duration, he made 300-400 more whp than your build.

I don't see it here a lot . greatful for that, I can take so much.

And make no mistake AP is a sharp cracker. He knows. I read his posts.

 

[ap72]

That could be true up to a point. But if it were true all the way across the board, then why don't they use turbos in Top Fuel and Funny Car instead of blowers....

Likely rules. Most of the classes the don't run turbos can't run turbos.

 

[CaptainCaveman]

Heat. And rules too from what I gather.

--edit definitely against the rules:


http://www.nhra.com/userfiles/file/

dig through some ofthe rule books... sheesh... strict...

 

[cobalt327]

You drive a what now?

Now, THAT is funny!